The California coast is an edge. It's the place where 1,100 miles of shoreline meets the largest ocean on the planet. Many different forces collide there, and a lot of exciting things happen. The coast is a geological edge, zippered to North America by 800 miles of the San Andreas Fault and battered by the Pacific Ocean.

"00O made it!" There was some news to celebrate on Sept. 28 in the email chain of scientists who work at the Cayo Santiago Field Station. Cayo Santiago is a 38-acre tropical island off the coast of Puerto Rico and home to approximately 1,500 rhesus monkeys, earning it the local nickname "Monkey Island."

Elon Musk has a plan, and it's about as audacious as they come. Not content with living on our pale blue dot, Musk and his company SpaceX want to colonize Mars, fast. They say they'll send a duo of supply ships to the red planet within five years. By 2024, they're aiming to send the first humans. From there they have visions of building a space port, a city and, ultimately, a planet they'd like to "geoengineer" to be as welcoming as a second Earth.

If he succeeds, Musk could thoroughly transform our relationship with our solar system, inspiring a new generation of scientists and engineers along the way. But between here and success, Musk and SpaceX will need to traverse an unbelievably complex risk landscape.

Clustered disasters hold our attention in ways that singular events cannot—they open our minds to the possibility that these aren't just accidents or natural phenomena to be painfully endured. As such, they can provoke debates over the larger "disaster lessons" we should be learning. And I would argue the combination of Harvey and Irma has triggered such a moment.

Editor's note: Under a trade deal concluded in May, China has begun exporting chicken to the U.S. Critics have pointed to China's record of food safety issues and argued the deal prioritizes commerce over public health. Here Maurice Pitesky, a poultry extension specialist at the University of California, Davis School of Veterinary Medicine with a focus on poultry health and food safety epidemiology, answers five questions about importing Chinese chicken.

1. Why is the U.S. importing chicken from China? Do we have a shortage?

Hardly. The U.S. is the largest poultry producer in the world, and the second-largest poultry exporter after Brazil. However, as part of a recent bilateral trade deal, China has agreed to accept imports of beef and liquefied natural gas from the U.S. In exchange, the U.S. is allowing China to export cooked poultry meat to the U.S.